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That reminds me of the time I replaced an old gravity boiler. I couldn't get the system to hold pressure, I went out to the van for some reason and noticed water shooting out the side of the house. Found the tank in the second floor bathroom and capped it off.

LOL, I had been forewarned by the guys that taught me that those types of systems exist. So i was too surprised when I finally ran into one.

LOL, I had been forewarned by the guys that taught me that those types of systems exist. So i was too surprised when I finally ran into one.

I gut stung another time too, we had a house that froze up and I was testing the lines headed upstairs and they wouldn't hold. I tore the the walls apart and fed new lines only to find a line headed towards the attic to the old exp tank. Oh well it was in the bid.

Why would I have STEAM vent in the attic.... I have seen H.W. expansion tanks in attics, and they did have a vent piped along with and above the exp. tank.... The second floor of these cottages have cast iron radiators and each piece of radiation has its own auto steam vent..... Why would they bring another vent into the attic?.... Thanks Frank S.